--- a/config/system-headers
+++ b/config/system-headers
@@ -552,16 +552,20 @@ intshcut.h
 inttypes.h
 iodef.h
 io.h
 IOKit/IOKitLib.h
 IOKit/IOMessage.h
 IOKit/pwr_mgt/IOPMLib.h
 iomanip
 iostream.h
+#if MOZ_JACK==1
+jack/jack.h
+jack/statistics.h
+#endif
 JavaControl.h
 JavaEmbedding/JavaControl.h
 JavaVM/jni.h
 JManager.h
 JNIEnvTests.h
 jni.h
 #if MOZ_SYSTEM_JPEG==1
 jpeglib.h

--- a/media/libcubeb/src/moz.build
+++ b/media/libcubeb/src/moz.build
@@ -14,25 +14,38 @@ SOURCES += [
 ]
 
 if CONFIG['MOZ_ALSA']:
     SOURCES += [
         'cubeb_alsa.c',
     ]
     DEFINES['USE_ALSA'] = True
 
+if CONFIG['MOZ_PULSEAUDIO'] or CONFIG['MOZ_JACK']:
+    SOURCES += [
+        'cubeb_resampler.cpp',
+    ]
+
 if CONFIG['MOZ_PULSEAUDIO']:
     SOURCES += [
         'cubeb_pulse.c',
-        'cubeb_resampler.cpp' # for tests
     ]
     DEFINES['USE_PULSE'] = True
     if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gonk':
         DEFINES['DISABLE_LIBPULSE_DLOPEN'] = True
 
+if CONFIG['MOZ_JACK']:
+    SOURCES += [
+        'cubeb_jack.cpp',
+    ]
+    USE_LIBS += [
+        'speex',
+    ]
+    DEFINES['USE_JACK'] = True
+
 if CONFIG['OS_ARCH'] == 'OpenBSD':
     SOURCES += [
         'cubeb_sndio.c',
     ]
     DEFINES['USE_SNDIO'] = True
 
 if CONFIG['OS_TARGET'] == 'Darwin':
     SOURCES += [

--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -63,16 +63,29 @@ def dmd(value):
 
 set_config('MOZ_DMD', dmd)
 set_define('MOZ_DMD', dmd)
 add_old_configure_assignment('MOZ_DMD', dmd)
 imply_option('--enable-profiling', dmd)
 imply_option('--enable-jemalloc', dmd)
 imply_option('--enable-replace-malloc', dmd)
 
+# JACK cubeb backend
+# ==============================================================
+option('--enable-jack', env='MOZ_JACK',
+       help='Enable JACK audio backend.')
+
+@depends('--enable-jack')
+def jack(value):
+    if value:
+        return True
+
+set_config('MOZ_JACK', jack)
+set_define('MOZ_JACK', jack)
+
 # Javascript engine
 # ==============================================================
 include('../js/moz.configure')
 
 
 # L10N
 # ==============================================================
 option('--with-l10n-base', nargs=1, env='L10NBASEDIR',